YOU SAID:
I will pee-pee on her tuna sandwich.
INTO JAPANESE
私が彼女のマグロ サンドイッチにおしっこおしっこです。
BACK INTO ENGLISH
My tuna sandwich she Pee and pee.
INTO JAPANESE
私のマグロは、彼女のおしっこ、おしっこをサンドイッチします。
BACK INTO ENGLISH
My tuna sandwich she Pee and pee.
That didn't even make that much sense in English.